Sealability And Friction Research On The Piston Rod Seals Components In Stirling Engine

Stirling engine is a external-heating or burning piston engines which usesHydrogen or Helium as medium, working by closed feedback thermal cycling withcontact seal equipment. The ideal Stirling engine should achieve excellent sealing，lowconsume and the lifetime demand of friction pair. Therefore, improving the workingperformance of sealing effect and reducing the wear extent of sealing elements is thekey point of the high-power sealing of Stirling engine.In this paper, the brief introduction of the basic theories and development outlineof Stirling engine is accomplished. On the basis of the explanation of piston rod sealmechanism, friction pair wear mechanism, the typical seal structure and the commonsealing element structures, the fitting piston rod seal structure is designed, that isassociate structure: cap sealing plus sliding sealing.In this paper, the research of cap sealing and sliding sealing and the contact forcemathematical model on the condition of pressure, temperature and assemblinginterference is firstly accomplished. Then, on the basis of wear mechanism, theinfluential elements of seal wear are researched, and the mathematical model of oilslick parameters according to friction ratio, harshness and volume wear extent isfounded. Flowingly, the Stirling piston rod sealing testing bed is established, whichprovides experimental methods to prove the validity and availability of oil slick model,and the effective rules of working parameters to sealing element function and wearingeffects. Finally, with the experiment results, the theoretical method that improves theworking performance and reduces the wear extent of Stirling engine piston rod sealingelements is proposed. And look forward to the future development of sealing device ofStirling engine.